My son is in the process of building me an upgraded computer with more kick-butt for running flight sims than what my old pooter has. He plans to use the Nvidia GeForce 9400 GT video card and some kind of dual-core processor which he didn't give me the name of and I don't know a dual core from an apple core so the terminology is lost on me. He asked about my prefs for an operating system and off the top of my head I said XP based on what I have read here at SOH. Anyway I would like some comments on your flight sim experiences with XP vs. Vista. Also, if you'd care to comment on video cards or processors I'd like to hear your thoughts. Maybe other folks besides me could benefit.